Table of Contents - Car diagnostic tool

www.obd2express.co.uk5. OBDII DiagnosticsThe OBD II Diagnostics function is a fast-access option that allowsyou to carry out a quick test on the engine system of OBD IIvehicles.When more than one vehicle control module is detected by thescan tool, you will be prompted to select the module where thedata may be retrieved. The most often to be selected are thePower-train Control Module [PCM] and Transmission ControlModule [TCM].CAUTION: Don’t connect or disconnect any test equipment withignition on or engine running.1) Turn the ignition off.2) Locate the vehicle’s 16-pin Data Link Connector (DLC).3) Plug the scan tool cable connector into the vehicle’s DLC.4) Turn the ignition on. Engine can be off or running.5) Turn on the scan tool. Select OBDII from the Main Screen.(Figure 3.1)6) Press the OK button to wait for the Menu to appear. A sequenceof messages displaying the OBDII protocols will be observedon the display until the vehicle protocol is detected.If the scan tool fails to communicate with the vehicle’s ECU(Engine Control Unit) more than three times, a “LINKINGERROR!” message shows up on the display.Verify that the ignition is ON.Check if the scan tool’s OBD II connector is securelyconnected to the vehicle’s DLC.Verify that the vehicle is OBD2 compliant.Turn the ignition off and wait for about 10 seconds. Turn theignition back to on and repeat the procedure from step 5.If the “LINKING ERROR” message does not go away, thenthere might be problems for the scan tool to communicate with22